Provided are a system and a method for controlling a frequency. The system for controlling the frequency includes: at least one power supplying unit generating power; at least one systematic unit consuming the power generated from the power supplying unit; at least one standby power unit storing the power generated from the power supplying unit and including at least one storage device; and at least one grid unit connecting the power supplying unit, the systematic unit, and the standby power unit to one another and controlling a frequency of the systematic unit.
Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A system for controlling a frequency, the system comprising: at least one power supplying unit generating power; at least one systematic unit consuming the power generated from the power supplying unit; at least one standby power unit storing the power generated from the power supplying unit and including a plurality of storage devices, wherein the at least one standby power unit includes a controlling unit, wherein the controlling unit is configured to determine whether an absolute value obtained by subtracting a first reference value of the state of charge (SOC) from the respective SOC of the storage devices is a predetermined first reference value or less, and cause the storage device having the SOC of the storage device of the first reference value or less to participate in the system for controlling the frequency; and at least one grid unit connecting the power supplying unit, the systematic unit, and the standby power unit to one another and controlling a frequency of power flowing to the systematic unit.
A frequency control system includes a power supply, a device that consumes power, a standby power unit with multiple batteries, and a grid unit connecting them. The standby power unit uses a controller to monitor the state of charge (SOC) of each battery. The controller determines if the difference between a target SOC and the actual SOC of a battery is below a threshold. If it is, that battery is activated to help control the frequency of the power delivered to the power-consuming device. The grid unit manages the power flow between the power supply, the consuming device, and the standby batteries, thus regulating the frequency of power delivered to the consuming device.
2. The system of claim 1 , wherein the plurality of storage devices being discharged when a frequency supplied to the systematic unit is decreased below a predetermined value and being charged when the frequency supplied to the systematic unit is increased above the predetermined value.
In the frequency control system where a standby power unit with multiple batteries connects a power supply and a power-consuming device, the batteries discharge to provide power when the frequency supplied to the consuming device drops below a defined level. Conversely, the batteries charge when the frequency supplied to the consuming device rises above a defined level. This charging and discharging behavior helps stabilize the frequency supplied to the power-consuming device using the standby batteries.
3. The system of claim 1 , wherein the controlling unit determining a use priority of the storage device using the state of charge (SOC) of the storage device.
In the frequency control system where a standby power unit with multiple batteries connects a power supply and a power-consuming device, a controller prioritizes the use of each battery based on its state of charge (SOC). Batteries with a higher SOC may be used before batteries with a lower SOC, or vice versa, depending on the control algorithm. This prioritization ensures that battery usage is optimized and that the standby power system operates efficiently to control frequency.
4. A method for controlling a frequency by the system for controlling the frequency of claim 1 , the method comprising: an operation of calculating a first SOC calculating the respective state of charge (SOC) of the storage devices constituting the standby power unit; an operation of determining a first SOC reference determining whether an absolute value obtained by subtracting a first reference value of the SOC from the SOC of the storage device calculated in the operation of calculating the first SOC is a predetermined first reference or less; an operation of participating a storage device participating the storage device having the SOC of the storage device of the first reference value or less in the operation of determining the first SOC reference in the system for controlling the frequency; an operation of determining a priority determining priorities of the storage devices participated in the operation of participating the storage device; an operation of requesting a frequency increase adjustment requesting the frequency increase adjustment by the systematic unit consuming the power generated from the power supplying unit; an operation of calculating the number of participated storage devices calculating, by the standby power unit storing the power generated from the power supplying unit and including one or more storage devices, the number of storage devices necessary to perform the frequency increase requested in the operation of requesting the frequency increase adjustment; an operation of adjusting a frequency increase increasing the frequency by applying the power stored in the storage device to the systematic unit in the case in which the storage devices as many as the necessary number calculated in the operation of calculating the storage device need to increase the frequency depending on the priority determined in the operation of determining the priority; an operation of calculating a second SOC calculating the respective SOC of the storage devices constituting the standby power unit; an operation of determining a second SOC reference determining whether an absolute value obtained by subtracting a second reference value of the SOC from the SOC of the storage device calculated in the operation of calculating the second SOC exceeds a predetermined second reference; and an operation of detaching a storage device detaching the storage device having the SOC of the storage device exceeding the second reference in the operation of determining the second SOC reference from the system for controlling the frequency.
A method for controlling frequency in a system with power supply, power-consuming device, and standby batteries involves these steps: First, calculate the state of charge (SOC) of each battery. Then, determine if the difference between a target SOC and the actual SOC of a battery is below a threshold. Batteries meeting this criteria are then activated for frequency control. Determine a priority for each active battery. When the power-consuming device requests a frequency increase, calculate the number of batteries needed to fulfill the request. Then, based on the battery priority, apply power from the required number of batteries to the power-consuming device to increase the frequency. Afterward, calculate SOC again and detach batteries exceeding a high SOC threshold to prevent overcharging.
5. A method for controlling a frequency by the system for controlling the frequency of claim 1 , the method comprising: an operation of calculating a first SOC calculating the respective state of charge (SOC) of the storage devices constituting the standby power unit; an operation of determining a first SOC reference determining whether the SOC of the storage device calculated in the operation of calculating the first SOC is a predetermined first reference value or less; an operation of participating a storage device participating the storage device having the SOC of the storage device of the first reference value or less in the operation of determining the first SOC reference in the system for controlling the frequency; an operation of determining a priority determining priorities of the storage devices participated in the operation of participating the storage device; an operation of requesting a frequency decrease adjustment requesting the frequency decrease adjustment by the systematic unit consuming the power generated from the power supplying unit; an operation of calculating the number of participated storage devices calculating, by the standby power unit storing the power generated from the power supplying unit and including one or more storage devices, the number of storage devices necessary to perform the frequency decrease requested in the operation of requesting the frequency decrease adjustment; an operation of adjusting a frequency decrease decreasing the frequency by charging the storage device with the power generated from the power supplying unit in the case in which the storage devices as many as the necessary number calculated in the operation of calculating the storage device need to decrease the frequency depending on the priority determined in the operation of determining the priority; an operation of calculating a second SOC calculating the respective SOC of the storage devices constituting the standby power unit; an operation of determining a second SOC reference determining whether the SOC of the storage device calculated in the operation of calculating the second SOC exceeds a predetermined second reference value; and an operation of detaching a storage device detaching the storage device having the SOC of the storage device exceeding the second reference value in the operation of determining the second SOC reference from the system for controlling the frequency.
A method for controlling frequency in a system with power supply, power-consuming device, and standby batteries involves these steps: First, calculate the state of charge (SOC) of each battery. Then, determine if the SOC of a battery is below a defined low threshold. Batteries meeting this criteria are then activated for frequency control. Determine a priority for each active battery. When the power-consuming device requests a frequency decrease, calculate the number of batteries needed to fulfill the request. Then, based on the battery priority, charge the required number of batteries using power from the power supply to decrease the frequency. Afterward, calculate SOC again and detach batteries exceeding a high SOC threshold to prevent overcharging.
6. The method of claim 4 , wherein the first reference value is an absolute value (|SOC−first reference value|) obtained by subtracting the first reference value from the SOC of the storage device and is between 10% and 30%.
In the frequency control method using standby batteries, where batteries participate when the difference between their SOC and a target is below a threshold, this SOC difference (absolute value |SOC - target|) is between 10% and 30%. This sets the sensitivity of battery activation; only batteries close to the target SOC level participate, refining the frequency control granularity.
7. The method of claim 6 , wherein the first reference value is between 40% and 80%.
In the frequency control method using standby batteries, where batteries participate when the difference between their SOC and a target is below a threshold, and the SOC difference (absolute value |SOC - target|) is between 10% and 30%, the target SOC value itself lies between 40% and 80%. This means the system targets a medium SOC for ideal operation and only activates batteries within +/- 10-30% of this mid-range SOC to participate in frequency control.
8. The method of claim 4 , wherein the second reference value is an absolute value (|SOC−second reference value|) obtained by subtracting the second reference value from the SOC of the storage device and is between 20% and 40%.
In the frequency control method using standby batteries, where batteries are detached when their SOC exceeds a threshold, this SOC difference (absolute value |SOC - target|) is between 20% and 40%. This defines the overcharge protection sensitivity; batteries far above the target SOC are detached to prevent damage or inefficiency.
9. The method of claim 8 , wherein the second reference value is between 40% and 80%.
In the frequency control method using standby batteries, where batteries are detached when their SOC exceeds a threshold, and the SOC difference (absolute value |SOC - target|) is between 20% and 40%, the target SOC value itself lies between 40% and 80%. The system detaches batteries whose SOC exceeds a value much higher than a target medium SOC to prevent damage.
10. The method of claim 4 , wherein in the case in which the storage device is added to the standby power unit, the added storage device is performed from the operation of calculating the SOC after a predetermined reference time lapses.
In the frequency control method using standby batteries, when a new battery is added to the standby power unit, its SOC is not immediately considered. Instead, the SOC calculation for this new battery begins only after a certain waiting period (reference time) has passed, giving the battery time to stabilize and provide a reliable SOC reading before being used for frequency control.
11. The method of claim 10 , wherein the reference time is between four seconds and thirty minutes after the storage device is added.
In the frequency control method where a new battery's SOC is ignored for a reference time after being added, this reference time is between four seconds and thirty minutes. This delay allows the battery to reach a stable state before participating in frequency control, preventing inaccurate SOC readings from affecting the system's performance.
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March 5, 2013
October 3, 2017
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